Synchronizing gear simulation in Scala

Introduction

A simulation of synchronizing gears modeled with akka-actors and scala-swing

Clone and run with:

mvn

Or run the main class GearGUI from the IDE.

Concepts

• Each Gear is an Akka Actor which is represented in the GearGUI by a slider
• The gears are supervised by the GearController Actor which coordinates and keeps the state
• The Receiver Actor coordinates updates from the GearController to the GearGUI

What is the purpose of...

...the slider colors:

• green: Gear is synced (= has the same speed as the calculated sync speed)
• yellow: Gear in progress
• red: Gear has been sabotaged (= a new speed was forced)
• magenta: Gear had an exception and is restarted by the supervisor
• black: Gear had 2 exceptions within 2 seconds (double click to revive)

...the parameters in the code:

• GearGUI nOfGears (increase if you want to have more gears)
• Gear errorLevel (raise initial value here to have more exceptions or use Slider in GUI)
• Gear sleepTime (raise initial value here to slow down simulation or use Slider in GUI)

History

Update to akka 2.5.23 and Scala 2.13.0

• Update pom.xml, note that scala-swing is now maintained by the community
• Remove obsolete stuff and minor refactorings

Update to akka 2.5.4 and Scala 2.11.11

• Update pom.xml
• Adjust the params in Gear for faster completion
• Add deprecated note for Typesafe Console

Update to akka 2.3.8 and Scala 2.11.4

• Set the ErrorLevel via Slider from GUI
• Run Application via sbt-atmos plug-in
• Usage of Typesafe Console (deprecated) via via sbt-atmos plug-in

./sbt
> atmos:run-main ch.clx.geargui.GearGUI
[info] Starting Atmos and Typesafe Console ...
[info] Typesafe Console is available at http://localhost:9900

Update to akka 2.2.3

• Change the gear actor behaviour with "akka become", so there is no need for a local var "speed" anymore
• Minor enhancements: Removed ActorRefs in Messages
• Added sbt and support for monitoring with Typesafe Console via sbt-atmos plug-in https://github.com/sbt/sbt-atmos

Update to akka 2.1.0 and Scala 2.10 (this branch)

• Forked from dhob/scala_gear_simulation
• Changed akka implementation from 1.3 -> 2.0 -> 2.1 using the akka migration guides
• Fault Tolerance through Supervisor Strategies a(k)ka "Let it crash"
• Minor enhancements to the GUI

Monitoring

• YourKit for thread activity
• Typesafe Console via sbt-atmos plug-in